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<table width="100%" summary="page for orings"><tr><td>orings</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Challenger O-rings Data</h2>

<h3>Description</h3>

<p>Record of the number and type of O-ring failures prior to the
tragic Challenger mission in January, 1986.
</p>


<h3>Usage</h3>

<pre>orings</pre>


<h3>Format</h3>

<p>This data frame contains the following columns:
</p>

<dl>
<dt>Temperature</dt><dd><p>O-ring temperature for each test firing or
actual launch of the shuttle rocket engine</p>
</dd>
<dt>Erosion</dt><dd><p>Number of erosion incidents </p>
</dd>
<dt>Blowby</dt><dd><p>Number of blowby incidents</p>
</dd>
<dt>Total</dt><dd><p>Total number of incidents</p>
</dd>
</dl>



<h3>Source</h3>

<p>Presidential Commission on the Space Shuttle Challenger Accident, 
Vol. 1, 1986: 129-131.  
</p>


<h3>References</h3>

<p>Tufte, E. R. 1997. Visual Explanations. Graphics Press, Cheshire,
Connecticut, U.S.A.
</p>


<h3>Examples</h3>

<pre>
oldpar &lt;- par(mfrow=c(1,2))
plot(Total~Temperature, data = orings[c(1,2,4,11,13,18),]) # the 
               # observations included in the pre-launch charts
plot(Total~Temperature, data = orings)
par(oldpar)
</pre>


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